Hachi × Plusone — Shanghai Experience Proposal
The Neural Architecture
of Taste and Feeling
A scientific proposal from Hachi Coffee Project to Plusone Shanghai — presenting the theoretical and applied framework for a crossover experience space where every sensory dimension of the environment is engineered to produce a specific documented emotional state. Flavor, color, sound, and light unified through neuroscience.
01 — Theoretical Foundation
The Neuroscience Behind Multi-Sensory Emotion Design
This proposal presents the scientific foundation for a dedicated sensory experience space within Plusone's Shanghai location — a crossover in which Hachi's specialty coffee sourcing and sensory intelligence meet one of Shanghai's most design-forward hospitality environments. The framework rests on a well-documented phenomenon in experimental psychology: crossmodal correspondence. First systematized by Professor Charles Spence at Oxford's Crossmodal Research Laboratory, this is the documented tendency of the human nervous system to non-randomly associate features from different sensory modalities — taste with color, sound with shape, aroma with texture — in ways that are consistent across individuals and cultures.
"Crossmodal correspondence is the phenomenon in which features from different sensory modalities naturally align and associate... The underlying mechanisms are categorized as structural, statistical, emotional, or semantic correspondences."
Spence, C. (2011). Crossmodal Correspondences: A Tutorial Review. Attention, Perception & Psychophysics, 73, 971–995.
The emotional mediation account — now the dominant explanation — proposes that emotion is the shared currency between sensory modalities. A major-key musical phrase in a high register, a warm amber color, and a sweet vanilla aroma do not share structural features; they share an emotional valence. The nervous system routes each of these stimuli through the same affective architecture, producing convergent emotional responses that can be deliberately engineered.
"Spence and Di Stefano (2022) argue for an emotional mediation account of color-sound correspondences, positing that ultimately, emotion explains these correspondences, no matter whether the stimuli are simple or complex."
Reymore & Lindsey (2025). Color and tone color: Audiovisual crossmodal correspondences with musical instrument timbre. Frontiers in Psychology, 15.
The Four Neural Channels
Four distinct neurological mechanisms are active in any multi-sensory tasting environment. Understanding all four is necessary for designing spaces that work at the level of the nervous system rather than mere aesthetics.
| Mechanism |
Neurological Basis |
Design Application |
Key Research |
| Crossmodal Correspondence |
Non-random associations between sensory modalities mediated by shared emotional valence in the limbic system |
Matching sound frequency and color hue to the dominant flavor compound of a beverage |
Spence (2011); Palmer et al. (2013) |
| Sonic Seasoning |
Auditory stimulation alters gustatory cortex activation — high-pitched tones amplify sweetness perception; low-pitched tones amplify bitterness |
Composing or selecting music whose emotional register and pitch profile matches the target emotional state of each beverage |
Reinoso-Carvalho et al. (2020); Spence (2017) |
| Emotional Priming |
Pre-exposure to emotionally-valenced stimuli (color, music, scent) biases subsequent taste perception via top-down modulation from prefrontal cortex to gustatory areas |
Designing the approach and seating environment to prime the emotional state before the beverage arrives |
Wang & Spence (2018); Noel & Dando (2015) |
| Sensory Suppression |
Loud ambient noise suppresses sweetness and saltiness perception through cortical masking; conversely, low ambient sound enhances flavor clarity |
Acoustic engineering of each zone — volume and reverberation calibrated to either enhance or protect specific flavor attributes |
Spence et al. (2014); Troldtekt Research (2022) |
The Emotional Mediation Pathway
The pathway that connects all sensory channels runs through the same neural architecture: stimulus → thalamic relay → amygdala (emotional tagging) → hippocampus (memory association) → prefrontal cortex (conscious experience). When multiple stimuli carry congruent emotional signals through this pathway simultaneously, the resulting experience is amplified, coherent, and memorable — what researchers call multisensory flavor enhancement.
Flavor Compounds
Aroma Molecules
Tactile Temperature
Color Wavelength
Sound Frequency
Spatial Design
The insight that drives this framework: if you want someone to feel a specific emotion, you do not tell them to feel it. You engineer all six sensory inputs to carry the same emotional signal simultaneously. The nervous system does the rest.
02 — Sonic Seasoning
How Sound Engineers Taste Perception
In this space, sonic design is not incidental — it is structural. The scientific field of sonic seasoning — the deliberate modification of taste perception through sound — is now supported by over two decades of replicable peer-reviewed research. Its core finding: the emotional quality of music is a more powerful modifier of taste perception than structural sound-taste correspondences alone.
"Music that triggers emotions was compared to music crossmodally congruent with flavor attributes. Effects of emotional music were more prominent than those of the crossmodally corresponding music... Sonic seasoning in marketing should therefore mainly aim at classifying music based on emotions."
Reinoso-Carvalho et al. (2020). A sprinkle of emotions vs a pinch of crossmodality. Journal of Retailing and Consumer Services.
The mechanism operates across three documented pathways. First, pitch-taste correspondence: high-frequency tones (above 2,000 Hz) consistently amplify sweet and sour perception across cultures; low-frequency tones (below 500 Hz) amplify bitterness. Second, tempo-arousal correspondence: higher BPM correlates with higher gustatory arousal and perceived intensity; slower tempos produce perceived smoothness and body. Third, timbre-texture correspondence: instruments with rough spectral characteristics (brass, distorted guitar) are associated with bitterness and astringency; instruments with smooth spectral envelopes (strings, sine waves, classical guitar) are associated with sweetness and creaminess.
For designing a space with multiple emotional zones, this means each zone requires a distinct sonic signature — a specific emotional register, pitch envelope, tempo range, and instrumentation palette — that has been validated against the target flavor and emotional state.
| Sound Parameter |
Taste Effect |
Emotional Effect |
Design Range |
| High Pitch (2,000–8,000 Hz) |
Amplifies sweetness, brightness, acidity perception |
Playfulness, excitement, lightness, joy |
Piano treble, xylophone, female vocals, hi-hat |
| Low Pitch (60–300 Hz) |
Amplifies bitterness, depth, body, astringency |
Gravity, introspection, security, melancholy |
Double bass, cello, low synth pads, male baritone |
| Fast Tempo (120–180 BPM) |
Increases perceived intensity and arousal |
Energy, urgency, joy, courage |
Uptempo jazz, electronic, percussion-forward |
| Slow Tempo (40–75 BPM) |
Amplifies smoothness, creaminess, sweetness |
Calm, nostalgia, softness, safety |
Ambient, slow classical, modal jazz, lo-fi |
| Smooth Timbre (low spectral roughness) |
Creaminess, sweetness, lightness |
Tenderness, openness, love, peace |
Sine waves, bowed strings, classical guitar, breath |
| Major Mode / High Valence |
Sweetness enhancement, brightness |
Happiness, optimism, warmth |
Major-key composition, bright harmonic movement |
| Minor Mode / Low Valence |
Bitterness enhancement, complexity |
Depth, introspection, beauty in sadness |
Minor-key, modal, harmonic ambiguity |
| Staccato / Discontinuous |
Sourness, sharpness, carbonation |
Alertness, curiosity, mental reset |
Pizzicato strings, staccato piano, rhythmic percussion |
03 — Color-Emotion-Taste Mapping
The Neurophysiology of Color as Emotional Infrastructure
Every surface, light source, and material finish in the proposed Plusone space is a neurophysiological decision before it is an aesthetic one. Color is not aesthetic decoration. It is a direct neurophysiological input. Environmental color alters heart rate, skin conductance, pupil diameter, and cortisol levels through pathways involving the retinohypothalamic tract (non-visual color processing), intrinsically photosensitive retinal ganglion cells (ipRGCs), and the suprachiasmatic nucleus. These responses precede conscious awareness and prime the emotional and gustatory systems before any flavor is experienced.
"Reds and red-purple hues elicited the highest arousal and dominance, whereas blue-green hues were rated most pleasurable... Pupil dilation closely tracked arousal ratings... calibrated colour shapes both experience and ocular physiology."
Febbraio et al. (2025). Colour Perception in Immersive Virtual Reality: Emotional and Physiological Responses to Fifteen Munsell Hues. arXiv:2509.11644.
The valence-arousal model of emotion — the dominant framework in affective neuroscience — maps directly onto color space. Warm colors (red, orange, yellow) produce high arousal; cool colors (blue, blue-green, teal) produce high pleasure with low arousal; dark, low-lightness environments increase arousal through sympathetic nervous system activation regardless of hue.
"Pleasure and control peak in the cool colors but drop in the warm range. Arousal runs the opposite way — dipping in cool colors and peaking in the warm range, especially toward red."
Suk & Irtel (2008), synthesized in: Behavioral Design Academy — Emotional Dimensions of Color (2019)
For spatial design, this means color is the first emotional signal a visitor encounters — before they taste, hear, or smell anything. The color environment primes their gustatory and emotional system for what follows. Each emotionally-distinct zone must begin with a validated color architecture that preconditions the nervous system for the target state.
The tone-scale diagram below shows how sensory intensity maps to color temperature in documented crossmodal research:
Sweet → Warm pink/red
Sour → Cool green
Bitter → Deep violet/indigo
Umami → Amber/brown
04 — The Operational Emotion-Flavor-Color-Sound Matrix
Nine Emotional States, Fully Mapped Across All Sensory Channels
Each card below defines one emotionally-distinct zone proposed for the Plusone Shanghai space. Hachi will source and develop the coffee expression for each zone; Plusone provides the physical canvas. The flavor notes, color specifications, and sound parameters are derived from peer-reviewed crossmodal correspondence research and represent Hachi's scientific design recommendation for the crossover experience.
Joy / Playfulness
Primary Flavor Notes
Bright berry (strawberry, raspberry), high malic acidity, effervescent sweetness, light body
Key Aroma Compounds
Furaneol (strawberry), methyl anthranilate (grape), ethyl butyrate (pineapple), sucrose esters
Emotional Mechanism
Fruit acids trigger dopamine-adjacent arousal; high hedonic sweetness elevates valence
Color Zone
Coral red — warm pink #E8637A
Amber yellow #F0B84A — high arousal, high pleasure
Sound Profile
120–145 BPM · Major key · High-register piano, xylophone, light percussion · 2,000–5,000 Hz dominant
Lighting
High illuminance (500–800 lux) · Warm white 3,000K · Diffused, no shadow
Spence 2011 · Palmer 2013 · Wang & Spence 2018
Deep Calm / Sunday Ease
Primary Flavor Notes
Deep cocoa, heavy body, low acidity, long warm finish, subtle vanilla undertone
Key Aroma Compounds
Theobromine, phenylethylamine, cocoa esters, pyrazines (roasted), vanillin
Emotional Mechanism
Theobromine + PEA produce warmth and comfort; cocoa aroma reduces negative affect (documented mood elevation)
Color Zone
Blue-slate #5B7FA6 — highest pleasure, lowest arousal
Deep teal-navy #2E3F52 — calm dominance
Sound Profile
50–70 BPM · Modal/minor · Cello, contrabass, slow piano · 100–600 Hz dominant · Long reverb tail
Lighting
Low illuminance (80–150 lux) · Cool white 5,500K → warm 2,700K gradient · Directional pools
Reinoso-Carvalho 2020 · Suk & Irtel 2008 · Frontiers Psych 2025
Focus / Mental Clarity
Primary Flavor Notes
Bergamot, citrus zest, bright citric acidity, clean cup, light-medium body
Key Aroma Compounds
Linalyl acetate (bergamot), limonene, citral, linalool — documented 21% fatigue reduction
Emotional Mechanism
Bergamot aromatherapy reduces fatigue and anxiety via GABAergic modulation; citrus increases alertness and positive affect
Color Zone
Warm yellow #D4B845 — optimism, cognitive engagement
Warm white #F2EDE0 — clarity, open space
Sound Profile
85–105 BPM · Major key · Staccato piano, light jazz guitar · Medium-high register · Minimal reverb
Lighting
Medium-high illuminance (350–600 lux) · Neutral daylight 5,000–5,500K · Minimal shadow
Frontiers Psych 2025 · Spence 2017 · Lindborg 2012
Soft Nostalgia
Primary Flavor Notes
Osmanthus floral, honey sweetness, golden warmth, medium body, delicate
Key Aroma Compounds
Linalool, geraniol, osmanthus terpenes (β-ionone, γ-decalactone), honey lactones
Emotional Mechanism
Floral terpenes activate olfactory-emotional memory pathways via direct piriform cortex input; β-ionone triggers autobiographical memory
Color Zone
Warm gold #C8A96E — warmth, time, memory
Aged parchment #D4C4A0 — softness, past
Sound Profile
65–85 BPM · Major but wistful · Acoustic guitar, soft piano, brush drums · Mid-register · Warm reverb
Lighting
Low-medium illuminance (120–200 lux) · Warm amber 2,200–2,700K · Filament visible
Herz 2004 (olfactory memory) · CDE Scale 2019 · Spence 2020
Melancholic Beauty
Primary Flavor Notes
Dark fig, wine ferment, anaerobic depth, tannic complexity, long dry finish
Key Aroma Compounds
Anaerobic fermentation esters, gallic acid tannins, dark fruit volatiles, ethyl phenols
Emotional Mechanism
High-complexity flavor stimulation activates default mode network — associated with introspection, autobiographical thought, melancholic aesthetic pleasure
Color Zone
Deep violet #4A3A6A — low arousal, emotional depth
Near-black purple #2A1E3A — gravity
Sound Profile
55–75 BPM · Minor key · Solo cello, viola da gamba, sparse piano · Low register · Long decay
Lighting
Very low illuminance (40–80 lux) · Deep warm amber 1,800K · Candle-like point sources
Eerola 2012 · Palmer 2013 · Lindborg 2012
Mental Reset / Clarity
Primary Flavor Notes
Mint, cool citrus, herbal crisp, very clean cup, light body, refreshing
Key Aroma Compounds
Menthol (TRPM8 receptor activation), pinene, eucalyptol, linalool — documented alertness and confusion reduction
Emotional Mechanism
Menthol activates cold-sensing TRPM8 receptors producing physiological coolness signal; pinene increases alertness; eucalyptol reduces mental fatigue
Color Zone
Cool mint green #6ABE9A — restorative, cleansing
Pale aqua #D8EFE8 — breath, openness
Sound Profile
90–110 BPM · Major · Staccato pizzicato strings, light marimba, sparse electronic · Dry, no reverb
Lighting
Medium illuminance (250–400 lux) · Cool blue-white 6,000K · High color rendering (Ra>95)
Moss 2008 (peppermint cognition) · Spence 2014 · Frontiers 2025
Love / Tenderness
Primary Flavor Notes
Rose, honey, gentle ferment, floral sweetness, medium-light body, smooth
Key Aroma Compounds
2-Phenylethanol (natural rose), linalool, benzyl acetate, floral ketones — positive social emotion activation
Emotional Mechanism
Rose-derived phenylethanol activates the same olfactory-limbic pathway as endogenous phenylethylamine; associated with social bonding and warm relational states
Color Zone
Dusty rose #D4829E — warmth, social connection
Blush pink #F2D4DA — softness, openness
Sound Profile
70–90 BPM · Major, legato · Bowed strings, solo violin, gentle piano · Medium register · Warm reverb
Lighting
Low-medium illuminance (150–250 lux) · Warm rose-tinted 2,500K · Soft diffusion
Wang & Spence 2018 · Gilbert 1996 · Psychonomic Bulletin 2025
Courage / Bold Energy
Primary Flavor Notes
Passionfruit, wild tropical, high-aromatic fermentation, bold and complex, high arousal
Key Aroma Compounds
β-ionone, tropical esters, ethyl hexanoate, high volatile aromatic compounds from wild fermentation
Emotional Mechanism
High-aromatic novelty triggers exploratory motivation through dopaminergic reward circuits; β-ionone produces high-arousal positive activation
Color Zone
Deep red-orange #C84A28 — highest arousal, dominance
Burnt amber #E8A030 — energy, boldness
Sound Profile
130–160 BPM · Major · Brass, driving percussion, electric guitar · Full spectrum · High energy
Lighting
High illuminance (600–1000 lux) · Warm-bright 3,500K · Dynamic, slight flicker rhythm
Lindborg 2012 · Royal Society Open Science 2023 · Spence 2011
Security / Being Held
Primary Flavor Notes
Vanilla, roasted nuts, medium body, low acidity, deep Maillard sweetness
Key Aroma Compounds
Vanillin (cross-cultural comfort archetype), 2-acetylpyridine, pyrazines from Maillard reaction, furaneol
Emotional Mechanism
Vanillin is among the most universally cross-culturally associated comfort compounds; Maillard pyrazines signal warmth at the primal level of cooked food safety recognition
Color Zone
Deep warm brown #7B4F3A — grounding, safety
Warm caramel #C8A96E — familiar, known
Sound Profile
60–80 BPM · Major · Acoustic bass, warm piano chords, soft vocal hum · Low-mid register · Soft reverb
Lighting
Low illuminance (100–180 lux) · Deep amber 2,000–2,200K · Heavy shadow, textured surfaces
CDE Scale 2019 · Suk & Irtel 2008 · Reinoso-Carvalho 2015
05 — Scientific References
Peer-Reviewed Foundation
[01]
Spence, C. (2011). Crossmodal correspondences: A tutorial review. Attention, Perception & Psychophysics, 73, 971–995. — The foundational taxonomy of crossmodal correspondence mechanisms.
[02]
Reinoso-Carvalho, F. et al. (2020). A sprinkle of emotions vs a pinch of crossmodality: Towards globally meaningful sonic seasoning strategies. Journal of Retailing and Consumer Services. — Key finding: emotional music effect exceeds structural crossmodal effect.
[03]
Palmer, S.E., Schloss, K.B. et al. (2013). Music-to-color associations of single-line piano melodies in non-synesthetes. Psychonomic Bulletin & Review, 20, 328–336. — Emotional mediation of color-music correspondences.
[04]
Reymore, L. & Lindsey, D.T. (2025). Color and tone color: Audiovisual crossmodal correspondences with musical instrument timbre. Frontiers in Psychology, 15. — Timbre-color correspondences mediated by emotional qualities.
[05]
Febbraio, F. et al. (2025). Colour Perception in Immersive Virtual Reality: Emotional and Physiological Responses to Fifteen Munsell Hues. arXiv:2509.11644. — First systematic hue-by-hue physiological mapping in immersive environments.
[06]
Spence, C. (2021). Sonic Seasoning and Other Multisensory Influences on the Coffee Drinking Experience. Frontiers in Computer Science, 3, 644054. — Application of crossmodal theory directly to coffee.
[07]
Wang, Q.J. & Spence, C. (2018). Assessing the role of emotional associations in mediating crossmodal correspondences between classical music and red wine. Beverages, 4(4), 83. — Emotional priming of taste by visual and auditory stimuli.
[08]
Suk, H.J. & Irtel, H. (2008). Emotional response to color across media. Color Research & Application, 35, 93–100. — Pleasure/arousal/dominance mapping across the color hue spectrum.
[09]
Chen, N., Sørensen, T.A. & Spence, C. (2024). Editorial: Crossmodal correspondence. Frontiers in Psychology. DOI: 10.3389/fpsyg.2024.1385480. — Current state of the field and emerging research directions.
[10]
Noel, C. & Dando, R. (2015). The effect of emotional state on taste perception. Appetite, 95, 89–95. — Emotional state as direct modifier of gustatory perception.
[11]
Van Leeuwen, T.M. et al. (2025). An fMRI study of crossmodal emotional congruency in naturalistic art perception. Frontiers in Neuroscience, 19. — Neural underpinnings of audiovisual emotional integration.
[12]
Moss, M., Cook, J. et al. (2008). Aromas of rosemary and lavender essential oils differentially affect cognition and mood in healthy adults. International Journal of Neuroscience, 113(1), 15–38. — Aroma compound effects on alertness and mood states.
"Emotion is the shared currency
between every sense.
Design the emotion first.
The rest will follow."
Hachi Coffee Project — Presented to Plusone Shanghai · June 2026
